Silence From My Sailor

My boyfriend and I have known each other for three years and have been dating since January. He shipped off to basic in April, and it has been 30 days and I haven't gotten any letters. His mom got his graduation packet and another letter and so I have his address and have been mailing him 4-6 times a week. His best friend Josh also got a letter the same day as his mother and then a phone call as well, yet I haven't received anything, should I be worried? I already told him I had saved enough to go to his graduation since he leaves for A-school straight after graduation, but I don't want to book a flight or hotel if it turns out that we're not working out.